Vehicle backward movement detection apparatus and vehicle braking force control apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNoritaka Yamada, Takashi Orimoto
Life of this patent
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Abstract
A vehicle braking force control apparatus detects a period of time from when a braking force of a brake device is cancelled until a vehicle body speed in the backwards direction of a vehicle on a hill reaches a predetermined state, determines a brake output according to the detected period of time, and controls braking pressure according to the determined brake output. The period of time depends on the gradient of the hill. Therefore, by determining the brake output according to this period of time, braking force control according to the gradient of the hill is made possible even at an extremely slow speed at which the vehicle speed is undetectable.
Claims18
A vehicle braking force control apparatus, which is provided with a brake device, comprising:
- a time detecting device which detects a period of time from when a braking force of the brake device is cancelled until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- a controller which applies the braking force in response to the period of time detected by the time detecting device.
A vehicle backward movement detection apparatus comprising:
- a wheel speed sensor that detects the speed of a wheel;
- and
- a detecting portion that detects backward movement of a vehicle at a vehicle body speed equal to, or less than, a detection limit of the wheel speed sensor, wherein the detecting portion detects, as a factor related to the vehicle body speed, a period of time from when a braking force of a brake device of the vehicle is cancelled until the vehicle body speed in a backward direction of the vehicle on a hill reaches a predetermined state.
A vehicle braking force control method comprising the steps of:
- detecting a period of time from when a braking force of the brake device is cancelled until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- applying the braking force in response to the detected period of time.
A vehicle backward movement detection method comprising the steps of:
- detecting a speed of a wheel;
- and
- detecting backward movement of a vehicle at a vehicle body speed equal to, or less than, a detection limit of the wheel speed sensor, as a factor related to the vehicle body speed, a period of time from when a braking force of a brake device of the vehicle is cancelled until the vehicle body speed in a backward direction of the vehicle on a hill reaches a predetermined state.
A vehicle braking force control apparatus, which is provided with a brake device, comprising:
- time detecting means for detecting a period of time from when a braking force of the brake device is cancelled until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- controlling means for applying the braking force in response to the period of time detected by the time detecting means.
A vehicle braking force control apparatus, which is provided with a brake device, comprising:
- a time detecting device which detects a period of time from when a switch for a brake pedal lamp is off until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- a controller which applies the braking force in response to the period of time detected by the time detecting device.
A vehicle braking force control apparatus, which is provided with a brake device, comprising:
- a time detecting device which detects a period of time from when a brake pedal is released until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- a controller which applies the braking force in response to the period of time detected by the time detecting device.
A vehicle braking force control apparatus, which is provided with a brake device, comprising:
- a time detecting device which detects a period of time from when a master cylinder pressure is less than a predetermined value until a backward movement of a vehicle on a hill reaches a predetermined state;
- and
- a controller which applies the braking force in response to the period of time detected by the time detecting device.
Dependencies are inferred from the claim text.